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Calculus

GATE CSE 2022 · Q34

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The value of the following limit is ________. lim⁡x→0+x1−e2x\lim_{x \to 0+} \frac{\sqrt{x}}{1 - e^{2\sqrt{x}}}

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Official answer: -0.5 (±0)

Calculus

We need to evaluate the limit:

L=lim⁡x→0+x1−e2xL = \lim_{x \to 0^+} \frac{\sqrt{x}}{1 - e^{2\sqrt{x}}}

Let y=xy = \sqrt{x}. As x→0+x \to 0^+, y→0+y \to 0^+.

Substituting yy into the limit gives:

L=lim⁡y→0+y1−e2yL = \lim_{y \to 0^+} \frac{y}{1 - e^{2y}}

This is an indeterminate form of type 00\frac{0}{0}. Applying L'Hôpital's Rule by differentiating the numerator and the denominator with respect to yy:

ddy[y]=1\frac{d}{dy}[y] = 1
ddy[1−e2y]=−2e2y\frac{d}{dy}[1 - e^{2y}] = -2e^{2y}

Therefore:

L=lim⁡y→0+1−2e2y=1−2e0=−12=−0.5L = \lim_{y \to 0^+} \frac{1}{-2e^{2y}} = \frac{1}{-2e^0} = -\frac{1}{2} = -0.5

Thus, the value of the limit is -0.5.

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This Calculus previous year question is Q34 of the GATE CSE 2022 paper. Find more GATE CSE PYQs on Calculus in Engineering Mathematics, or browse all GATE CSE PYQs.

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Calculus in GATE CSE

Calculus has 40 GATE CSE PYQs across 25 papers from 2011 to 2026. 11 of them are 1-mark NAT questions like this one, and it is the only one in GATE CSE 2022.

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GateAI solution cardGATE CSE 2022 · Q34 · NAT

The value of the following limit is … limx → 0+ √(x)1 - e2√(x)

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